django rest framework nested fields with multiple models

This is django and django rest framework. I have 2 models: User and Phone.

first question:

I want to be able to update user data (email) as well as phone data (phone number) in 1 api update response. Phone numbers can be 0 or many. Well, it's actually like partial = True. If the user just wants to update the phone number then don't update the email and vice versa.

Additional Information: Phone is not included when registering. Just basic user information (last name, first name, email, password). After registration, the phone can only be updated in the user profile form. The user profile form is actually linked to multiple models i.e. "User and Phone"

second question:

How to serialize multiple phone_numbers and save to db?

class User(AbstractBaseUser):
    email = models.EmailField(unique=True, default='')
    USERNAME_FIELD = 'email'


class Phone(models.Model):
    phone_number = models.CharField(max_length=10)
    owner = models.ForeignKey(User)

--------------------------------------
class UserSerializer(serializers.ModelSerializer):
    phone_number = PhoneSerializer(required=False, many=True)

    class Meta:
        model = User
        fields = ('email, 'phone_number')


class PhoneSerializer(serializers.ModelSerializer):

     class Meta:
          Model = Phone
          fields = ('phone_number')

The phone number field of the html form will have a plus sign to indicate that new phone numbers can be added. example is here

email : [email protected]
phone number: 23423432423
(add more)
phone number: 3423423423
(add more)
...

expected json

{
'email': '[email protected]',
'phone_number': '32432433223234'
}

or if many phone numbers are added

{
'email': '[email protected]',
'phone_number': '32432433223234',
'phone_number': '324342322342323'
}

perhaps

{
'email': '[email protected]',
'phone_number': ['32432433223234','324342322342323']
}

perhaps

{
'email': '[email protected]',
'Phone': [{'id': 1, 'phone_number': '32432433223234'}, {'id': 2, 'phone_number': '324342322342323'}]
}

Can this json be done? How does serializer and modelviewset do this? sorry i'm new to drf